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    <meta charset="UTF-8" />
    <link rel="icon" href="/favicon.ico" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>混凝土物流调度监控系统</title>
  </head>
  <body>
    <div id="app">
      <div class="loader"></div>
    </div>
    <!-- 车辆图标 -->
    <svg class="hidden">
      <symbol
        id="truck"
        version="1.1"
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    <script type="module" src="/src/main.ts"></script>
  </body>

  <style>
    html,
    body,
    #app {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      width: 100%;
      height: 100%;
    }

    .loader {
      --d: 22px;

      width: 4px;
      height: 4px;
      color: #25b09b;
      border-radius: 50%;
      box-shadow:
        calc(1 * var(--d)) calc(0 * var(--d)) 0 0,
        calc(0.707 * var(--d)) calc(0.707 * var(--d)) 0 1px,
        calc(0 * var(--d)) calc(1 * var(--d)) 0 2px,
        calc(-0.707 * var(--d)) calc(0.707 * var(--d)) 0 3px,
        calc(-1 * var(--d)) calc(0 * var(--d)) 0 4px,
        calc(-0.707 * var(--d)) calc(-0.707 * var(--d)) 0 5px,
        calc(0 * var(--d)) calc(-1 * var(--d)) 0 6px;
      animation: l27 1s infinite steps(8);
    }

    @keyframes l27 {
      100% {
        transform: rotate(1turn);
      }
    }
  </style>
</html>
